ConsoleLogHandler Assumes Implementation

[garrypolley]

Right now this line https://github.com/cerner/canadarm/blob/master/lib/handler/console.js#L44 in the console log handler assumes there is a logAttribute.msg attribute. If you are not using the standard log appender then the attribute does not exist and the output just shows undefined, which is confusing.

Need to fix this to not assume the value exists. If it exists we should log it, if not don't log it.